REMOVE

1. workers
2. houses
3. roads
4. rock
5. plants
6. barriers

WHAT

1. banks (landforms) (1)
2. barns (1)
3. birds (animals) (1)
4. black-and-white film (1)
5. buildings (structures) (1)
6. doors (1)
7. exterior views (1)
8. farmhouses (1)
9. farms (1)
10. farmyards (1)
11. fences (1)
12. fields (land) (1)
13. forests (plant communitie … (1)
14. landscapes (representatio … (1)
15. porches (1)
16. sidewalks (1)
17. sky (1)
18. soil (1)
19. stairs (1)
20. trees (1)
21. utility poles (1)
22. Visual Works (hierarchy n … (1)
23. windows (1)
24. yards (areas) (1)

WHO

1. Campbell, Sandra L. Still (1)
2. Sandra L. Still Campbell; … (1)

WHEN

1. 1961 (1)
2. after 1961 (1)